package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.ControllerAdvice;

import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    private final UserMapper userMapper;
    private final StringRedisTemplate stringRedisTemplate;
    /**
     * 发送手机验证码
     *
     * @param phone
     * @param session
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1 校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2 如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3 符合生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4 保存验证码到session
//        session.setAttribute("code",code);
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);

        //5 发送验证码
        log.debug("发送验证码成功：{}",code);

        //返回ok
        return Result.ok();
    }

    /**
     * 登录功能
     *
     * @param loginForm 登录参数，包含手机号、验证码；或者手机号、密码
     * @param session
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1 校验手机号
        if(RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            return Result.fail("手机号格式错误");
        }

        //2 校验验证码
//        boolean codeIsSame = loginForm.getCode().equals(session.getAttribute("code"));
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + loginForm.getPhone());

        //3 不一致 报错
        if(cacheCode == null || !cacheCode.equals(loginForm.getCode())){
            return Result.fail("验证码错误");
        }

        //4 一致根据手机号查询用户
//        LambdaQueryWrapper wrapper = new LambdaQueryWrapper();
//        wrapper.eq(User::getPhone, loginForm.getPhone());
        User user = query().eq("phone", loginForm.getPhone()).one();

        //5 判断用户是否存在
        if(user == null){
            //6 不存在 创建用户并保存
            user = createUserWithPhone(loginForm.getPhone());
        }

        //7 保存用户信息到session  -》  迭代  存储到redis中
        //        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7.1 随机生成token  作为登录令牌
        String token = UUID.randomUUID().toString(false);
        //7.2 将user对象转为hash并存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userDTOMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //7.3 保存到redis中
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token,userDTOMap);
        //7.4 设置有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,LOGIN_USER_TTL,TimeUnit.MINUTES);

        //8 返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1 创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2. 保存用户
        this.save(user);
        return user;
    }
}
